diff options
| -rw-r--r-- | hw/misc/mos6522.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/hw/misc/mos6522.c b/hw/misc/mos6522.c index aa3bfe1..cecf0be 100644 --- a/hw/misc/mos6522.c +++ b/hw/misc/mos6522.c @@ -113,6 +113,10 @@ static int64_t get_next_irq_time(MOS6522State *s, MOS6522Timer *ti, int64_t d, next_time; unsigned int counter; + if (ti->frequency == 0) { + return INT64_MAX; + } + /* current counter value */ d = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - ti->load_time, ti->frequency, NANOSECONDS_PER_SECOND); @@ -149,10 +153,10 @@ static void mos6522_timer1_update(MOS6522State *s, MOS6522Timer *ti, if (!ti->timer) { return; } + ti->next_irq_time = get_next_irq_time(s, ti, current_time); if ((s->ier & T1_INT) == 0 || (s->acr & T1MODE) != T1MODE_CONT) { timer_del(ti->timer); } else { - ti->next_irq_time = get_next_irq_time(s, ti, current_time); timer_mod(ti->timer, ti->next_irq_time); } } @@ -163,10 +167,10 @@ static void mos6522_timer2_update(MOS6522State *s, MOS6522Timer *ti, if (!ti->timer) { return; } + ti->next_irq_time = get_next_irq_time(s, ti, current_time); if ((s->ier & T2_INT) == 0) { timer_del(ti->timer); } else { - ti->next_irq_time = get_next_irq_time(s, ti, current_time); timer_mod(ti->timer, ti->next_irq_time); } } |